Captive Portal to use with IPTables (with ip_set module). It's permit to control access from a sub-net to internet or to another sub-net. Uses unix account to validate users. It's an alternative to Natacl, Sphirewall, Zorp, Nocat, Nufw and others.

A dynamic tarpit that collects and distributes threat info throughout the resources of an organization, allows the sharing of that information and allows daemons to query it so that they can ignore threatening resource requests.

FireBucket is a project to create a Debian based Firewall/Router with WLAN and a choice of WAN (DSL) or UMTS/GPR connection. Als a choice of connection to UMTS/GPRS as a backup connction. A web configuration will also be implemented.

FWInit is a simple firewall initialization utility coded in Python with Python configuration scripts with access to useful functions for manipulating the iptables filters and keeping the same state between invocations.

GTCop Professional Security Appliance aims to provide a powerful tool for satellite communications, with enhanced QoS and bandwidth controls. As derived from IPCop Firewall, it is a stable, secure, easy to configure and maintain GNU/Linux firewall box.

PACtory is a highly customizable way for handling proxy configuration settings with a dynamically created .pac-File, also known as "Windows Proxy Auto Detection" or "wpad.dat"-File, which is generated on the fly while the client is requesting it.

PHANTUM - Punch-Hole Access for NAT Traversal of UDP in a Module; Built on top of Samy Kamkar's 'chownat' script, PHANTUM allows for pure client-agnostic TCP services to be tunneled over UDP and hosted behind NAT infrastructures.

Debian packages for PeerGuardian Linux (including the GUI) and its precessor moblock/blockcontrol/mobloquer.
PeerGuardian is a privacy oriented firewall application. It blocks connections to and from hosts specified in huge blocklists (thousands or millions of IP ranges). Its origins lie in targeting aggressive IPs while you use P2P.
See http://sourceforge.net/projects/peerguardian/

A very simple to use java firewall testing tool. Ever wanted to verify that a TCP or UDP network path is actually open? This tool has both server and client modes so you can test network paths between any two computers that have the Jave JRE installed.